如何将jar添加到Java编译路径？

Question

我对Java编程非常陌生，我正在尝试将jar添加到类路径中，如下所示：

javac -classpath ~/Downloads/algs4.jar. ThreeSum.java 

但我还是得到了这样的异常：

ThreeSum.java:38: error: cannot find symbol
                        StdOut.println(a[i] + " " + a[j] + " " + a[k]);
                        ^
  symbol:   variable StdOut
  location: class ThreeSum
ThreeSum.java:62: error: cannot find symbol
        int[] a = In.readInts(args[0]);
                  ^
  symbol:   variable In
  location: class ThreeSum
ThreeSum.java:64: error: cannot find symbol
        Stopwatch timer = new Stopwatch();
        ^
  symbol:   class Stopwatch
  location: class ThreeSum
ThreeSum.java:64: error: cannot find symbol
        Stopwatch timer = new Stopwatch();
                              ^
  symbol:   class Stopwatch
  location: class ThreeSum
ThreeSum.java:66: error: cannot find symbol
        StdOut.println("elapsed time = " + timer.elapsedTime());
        ^
  symbol:   variable StdOut
  location: class ThreeSum
ThreeSum.java:67: error: cannot find symbol
        StdOut.println(cnt);
        ^
  symbol:   variable StdOut
  location: class ThreeSum
6 errors

我在尝试here的程序

Answer 1

看起来你也需要下载这个JAR：http://introcs.cs.princeton.edu/java/stdlib/

它们没有包结构，因此将所有内容解压到同一个目录中：

jar xvf stdlib.jar
jar xvf algs4.jar

然后编译它：

javac -classpath . ThreeSum.java

Answer 2

您可能希望类路径的~/Downloads/algs4.jar.在Linux上为~/Downloads/algs4.jar:.，在Windows`上为~/Downloads/algs4.jar;.。